Hilus (hilar) cells: located in ovarian medulla, rarely within ovarian stroma; located away from the hilum, round to polygonal, epithelial appearing, presumed vestigial remnant of gonad from its "ambisexual" phase

Granulosa cell proliferation: an atretic follicle is filled with a proliferation of granulosa cells growing in a pattern resembling a microfollicular granulosa cell tumor (left); the granulosa cell layer of a cystic atretic follicle is replaced by solid tubules resembling a Sertoli cell tumor-the tubules are surrounded by a layer of theca lutein cells (right)

Ectopic decidua: one cell is vacuolated, somewhat resembling a signet- ring cell (left); large nodules were present on the ovarian and peritoneal surfaces, the cells have abundant eosinophilic cytoplasm and central, pale, round nuclei (right)

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